Locobase 5391 shows the New York, Ontario & Western X class Santa Fes, which seem to have been the direct ancestors of this set of TCI&RR engines. The Xs were produced in 1915, the 400s in 1917 (Alco works #57520, 57517-571519 - in order of road number) and 1923 (64980) So close is most of the data that Locobase has "borrowed" the superheater area from the X class as an estimate.
Yet there is a bit of mystery in the specifications, comparison of which show the firebox's length and width are identical in the two classes, firebox areas are comparable, the tube and flue lengths are identical, and the tube and flue counts very nearly so. But throughout their years on the NYW&O, the Xs were credited with 100 sq ft of grate area and better than 800 sq ft more evaporative heating surface than were the 1917 TCI&RR locomotives.
At time of writing, the compiler can only guess at the reason for the difference. Perhaps the Tennessee road used a "Gaines Wall" to reduce grate area that was after all too big for the boiler efficiently to use. Perhaps for the same reason some of the firetubes were actually sealed off.
| Specifications | |
|---|---|
| Class | 400 |
| Locobase ID | 9197 |
| Railroad | Tennessee Coal Iron & Railroad |
| Whyte | 2-10-2 |
| Road Numbers | 400-403 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1917 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase | 20' |
| Engine Wheelbase | 37.67' |
| Ratio of driving wheelbase to overall engine wheebase | 0.53 |
| Overall Wheelbase (engine & tender) | 67.92' |
| Axle Loading (Maximum Weight per Axle) | 61400 lbs |
| Weight on Drivers | 295400 lbs |
| Engine Weight | 353400 lbs |
| Tender Light Weight | 170000 lbs |
| Total Engine and Tender Weight | 523400 lbs |
| Tender Water Capacity | 9000 gals |
| Tender Fuel Capacity (oil/coal) | 7 tons |
| Minimum weight per yard of rail on which locomotive could run | 98 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 57" |
| Boiler Pressure | 190 psi |
| Cylinders (dia x stroke) | 28" x 32" |
| Tractive Effort | 71083 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.16 |
| Heating Ability | |
| Firebox Area | 325 sq. ft |
| Grate Area | 80.20 sq. ft |
| Evaporative Heating Surface | 3327 |
| Superheating Surface | 1007 |
| Combined Heating Surface | 4334 |
| Evaporative Heating Surface/Cylinder Volume | 145.88 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 15238 |
| Same as above plus superheater percentage | 18286 |
| Same as above but substitute firebox area for grate area | 74100 |
| Power L1 | 11092 |
| Power MT | 413.91 |
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